cryptix.provider.cipher
public final class Blowfish extends Cipher implements SymmetricCipher
Blowfish was designed by Bruce Schneier. The algorithm is in the public domain.
References:
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.8 $
Since: Cryptix 2.2
Constructor Summary | |
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Blowfish()
Constructs a Blowfish cipher object, in the UNINITIALIZED state.
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Method Summary | |
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Object | clone()
Always throws a CloneNotSupportedException (cloning of ciphers is not
supported for security reasons). |
protected int | engineBlockSize()
SPI: Returns the length of an input block, in bytes.
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protected Object | engineGetParameter(String param)
SPI: Gets the value of the specified algorithm parameter.
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protected void | engineInitDecrypt(Key key)
SPI: Initializes this cipher for decryption, using the
specified key.
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protected void | engineInitEncrypt(Key key)
SPI: Initializes this cipher for encryption, using the
specified key.
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protected void | engineSetParameter(String param, Object value)
SPI: Sets the specified algorithm parameter to the specified
value.
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protected int | engineUpdate(byte[] in, int inOffset, int inLen, byte[] out, int outOffset)
SPI: This is the main engine method for updating data.
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protected void | finalize() Cleans up resources used by this instance, if necessary. |
static LinkStatus | getLinkStatus()
Gets an object representing the native linking status of this class. |
int | getRounds()
Returns the currently set number of rounds for this instance.
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static void | main(String[] args) Entry point for very basic self_test . |
void | setRounds(int r)
Sets the number of rounds for this cipher. |
We define a "rounds" property to allow running the algorithm in a number of rounds different than the default value; i.e. 16. Note however that there is not enough defined initial data for any number of rounds other than 16 for the time being.
Throws: CryptixException if a CRC check fails on the initial values of the S and P boxes.
Returns: the length in bytes of an input block for this cipher.
Blowfish has a single parameter, "rounds", which specifies the number of rounds for this instance as a decimal String.
Parameters: param the string name of the parameter.
Returns: the object that represents the parameter value, or null if there is none.
Parameters: key the key to use for decryption.
Throws: InvalidKeyException when one of the following occurs:
CryptixException if any one of the two self-tests fail.
The two self-tests are as follows:
Parameters: key the key to use for encryption.
Throws: InvalidKeyException when one of the following occurs:
CryptixException if any one of the two self-tests fail.
The two self-tests are as follows:
Blowfish has a single parameter, "rounds", which specifies the number of rounds for this instance as a decimal String.
Parameters: param the string name of the parameter. value the parameter value.
Throws: InvalidParameterException if param is an invalid parameter for this cipher implementation, the parameter is already set and cannot be set again, a security exception occurs, and so on. InvalidParameterTypeException if value is of the wrong type.
in and out may be the same array, and the input and output regions may overlap.
Parameters: in the input data. inOffset the offset into in specifying where the data starts. inLen the length of the subarray. out the output array. outOffset the offset indicating where to start writing into the out array.
Returns: the number of bytes written.
Throws: CryptixException if the native library is being used, and it reports an error.
Returns: the number of rounds.
self_test
.If the specified number is invalid, an IllegalArgumentException is thrown.
Note that there is not enough defined initial data for any number of rounds other than 16 for the time being.
Parameters: r the desired number of rounds for this cipher.
Throws: IllegalArgumentException if the given number of rounds is not supported.
UNKNOWN: IllegalStateException if this cipher is not uninitialised.